The number of people joining the Crypto currency league are on the rise daily due to different postive reviews from others already in it but sadly some join the league and lost out.
The reasons could be:
1) lack of knowledge of Crypto currencies
2) Focus on bitcoin alone , this is as result of the first point, most people don't know any other coin other than bitcoin so they just push money into it , honestly Small Investors can make money from bitcoin Investment for instance you invest $20 into bitcoin now for you to get $10 bitcoin must be around $50,000 which may take time .
3) Fear to invest in small coins.